====test====
When I send a request to an operation
And the operation has a required header
And in the request I sent that header is missing
Then I should get a 422 response back
And the payload of the response should be in application/problem+json content-type
====spec====
openapi: 3.0.2
paths:
  /pet:
    get:
      parameters:
        - in: header
          name: x-age
          required: true
      responses:
        '200':
          description: ok
          content:
            application/json:
              example: "abc"
====server====
mock -p 4010 ${document}
====command====
curl -sIXGET http://127.0.0.1:4010/pet
====expect====
HTTP/1.1 422 Unprocessable Entity
content-type: application/problem+json